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RENR 205 (9)
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Lecture 29

RENR 205 Lecture 29: Actor = donor
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2 Pages
46 Views
Fall 2016

Department
Renewable Natural Resrces
Course Code
RENR 205
Professor
Ben Wu
Lecture
29

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Actor&=&donor
Kin&selection&=&indirect&selection
Promiscuity&=&no&lasting&reproductive&bonds&(e.g.&broadcast&spawners,&wild&pollinated&
plants)
Polygynandry&=&multiple&males&and&females&mate&with&each&other,&but&there&is&more&a&
bond&than&in&promiscuity&
Direct&benefit&=&material&benefit
Why&does&altruism&exist?
Coefficient&of&relatedness:&the&numerical&probability&of&an&individual&and&its&relatives&
carrying&copies&of&the&same&genes&from&a&recent&common&ancestor
The&coefficient&relatedness&(&r&)&in&Hamilton's&rule&is&the&same&as&the&probability&that&
two&organisms&share&a&particular&gene&by&direct&descent&
R=&coefficient&of&relatedness&between&donor&and&recipient
Altruism&will&be&favored&when&B&times&the&recipient's&r&is&greater&than&the&direct&
fitness&cost&to&the&donor&(&c&)&
For&altruism&to&evolve,&the&costLbenefit&ratio&must&be&<&than&r&
Consider&the&following&scenario.&You&can&either&raise&6&kids&yourself&or&forgo&your&
reproduction&and&help&a&relative&raise&X&number&of&kids.&You&get&to&chose&the&relative&
to&help.&What&would&be&in&your&best&interest?
Help&an&uncle&raise&15&kids
A.
Help&a&first&cousin&raise&30&kids
B.
Help&a&full&sibling&raise&30&kids
C.
Help&a&full&sibling&raise&8&kids
D.
Help&your&identical& twin&raise&3&kids
E.
Help&your&niece&raise&24&kids
F.
Wednesday,& November& 2,&2016
2:14&PM

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Description
Wednesday,  November  2,  2016 2:14  PM • Actor  =  donor • Kin  selection  =  indirect  selection • Promiscuity  =  no  lasting  reproductive  bonds  (e.g.  broadcast  spawners,  wild  pollinated   plants) • Polygynandry  =  multiple  males  and  females  mate  with  each  other,  but  there  is  more  a   bond  than  in  promiscuity   • Direct  benefit  =  material  benefit Why  does  altruism  exist? Coefficient  of  relatedness:  the  numerical  probability  of  an  individual  and  its  relatives   carrying  copies  of  the  same  genes  from  a  recent  common  ancestor The  coefficient  relatedness  (  r  )  in  Hamilton's  rule  is  the  same  as  the  probability  that   two  organisms  share  a  particular  gene  by  direct  descent   B=  benefit  given  to  a  recipient  relative R=  coefficient  of  relatedness  between  donor  and  recipient Altruism  will  be
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